All countries in EU4 are identified by a tag. The tag order specifies in what order actions are resolved between tags[1].

For example, if Sweden is moving an army into a province a Danish army is moving away from, and both their movement is set to resolve on the same day, Sweden will catch the army as they are listed prior to Denmark on the order list.

Dynamic tags are countries created during the campaign without a pre-existing tag. They use a different 3-key identifier structure: the first a letter (based on type) and the other two are numbers. The tags are assigned according to order of creation. In terms of action order, dynamic tags act last.

The following table lists the dynamic tag types (first letter) and their max value[2].

Formable - Other countries may form this country if it does not exist. If it has been eliminated it may be formed by another country again.

Releasable - This country has cores in 1444, but is otherwise unplayable unless released by another country first. It has a sizable chance of appearing with the help of rebels or being released in a peace deal during the campaign.

Revolter - This country lacks cores in 1444. It has a small chance of appearing with the help of rebels during the campaign.